secure vs obtain

secure is an adjective but obtain is not an adjective.

Word	Noun	Adjective	Verb	Adverb
secure	No	Yes	Yes	No
obtain	No	No	Yes	No

As verbs, obtain is a hypernym of secure; that is, obtain is a word with a broader meaning than secure:

secure (adjective)	obtain (adjective)
free from fear or doubt; easy in mind
free from danger or risk
not likely to fail or give way
immune to attack; incapable of being tampered with
financially safe

secure (verb)	obtain (verb)
make certain of	receive a specified treatment (abstract)
cause to be firmly attached	come into possession of
fill or close tightly with or as if with a plug	be valid, applicable, or true
furnish with battens
get by special effort
assure payment of